Hardie J.K. Dolomite and siliciclastic dikes and sills in marginal-marine Cretaceous coals of central Utah / J. K. Hardie, 1994. - 19 p. - Текст : непосредственный.
Evaluation of coal resources in the eastern part of the Fort Peck Indian Reservation, Montana / L.R.Biewick,J.K.Hardie,C.Williamson,H.H.Arndt, 1990. - 136 p. - Текст : непосредственный.